I realize this may not be a big deal but the nav lights do not operate on only battery power. Since I haven't been able to find a wiring diagram, only schematics, I don't know how accurate this is. This would be the first airplane I have encountered that would be wired this way in my 50 years of aviation experience although I could be wrong. Yes, the nav lights will come on but only with external or APU power. Since FAA procedures specify nav lights on when an aircraft is powered up and the beacon light to be on when the engines are running, I don't understand why the airplane would be wired this way.
Eric Parker